:root {
    --bg-dark: #0f111a;
    --bg-panel: #1a1d2d;
    --bg-panel-glass: rgba(26, 29, 45, 0.7);
    --primary: #f59e0b;
    --primary-hover: #fbbf24;
    --secondary: #3b82f6;
    --success: #10b981;
    --danger: #ef4444;
    --text-main: #f8fafc;
    --text-muted: #94a3b8;
    --border-color: rgba(255, 255, 255, 0.08);
    --sidebar-width: 260px;
    --topbar-height: 70px;
    --shadow-sm: 0 4px 6px -1px rgba(0, 0, 0, 0.3);
    --shadow-md: 0 10px 15px -3px rgba(0, 0, 0, 0.5);
    --shadow-glow: 0 0 15px rgba(245, 158, 11, 0.3);
    --transition-fast: 0.2s ease;
    --transition-smooth: 0.4s cubic-bezier(0.4, 0, 0.2, 1);
}

* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

body {
    font-family: 'Inter', -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, sans-serif;
    background-color: var(--bg-dark);
    color: var(--text-main);
    overflow-x: hidden;
    line-height: 1.6;
}

/* Glassmorphism Utilities */
.glass-panel {
    background: var(--bg-panel-glass);
    backdrop-filter: blur(12px);
    -webkit-backdrop-filter: blur(12px);
    border: 1px solid var(--border-color);
    border-radius: 16px;
    box-shadow: var(--shadow-md);
}

/* Layout */
.admin-layout {
    display: flex;
    min-height: 100vh;
}

/* Sidebar */
.sidebar {
    width: var(--sidebar-width);
    background: var(--bg-panel);
    border-right: 1px solid var(--border-color);
    display: flex;
    flex-direction: column;
    position: fixed;
    height: 100vh;
    z-index: 100;
    transition: var(--transition-smooth);
}

.sidebar-header {
    height: var(--topbar-height);
    display: flex;
    align-items: center;
    padding: 0 24px;
    border-bottom: 1px solid var(--border-color);
    font-size: 22px;
    font-weight: 800;
    color: var(--primary);
    text-transform: uppercase;
    letter-spacing: 1.5px;
    text-shadow: var(--shadow-glow);
}

.sidebar-menu {
    list-style: none;
    padding: 20px 12px;
    overflow-y: auto;
    flex-grow: 1;
}

.sidebar-menu li {
    margin-bottom: 8px;
}

.sidebar-menu a {
    display: flex;
    align-items: center;
    padding: 12px 16px;
    color: var(--text-muted);
    text-decoration: none;
    border-radius: 10px;
    font-weight: 500;
    transition: var(--transition-fast);
}

.sidebar-menu a i {
    width: 24px;
    font-size: 18px;
    margin-right: 12px;
    transition: var(--transition-fast);
}

.sidebar-menu a:hover, .sidebar-menu a.active {
    background: rgba(245, 158, 11, 0.1);
    color: var(--primary);
}

.sidebar-menu a:hover i, .sidebar-menu a.active i {
    color: var(--primary);
    transform: scale(1.1);
}

/* Main Content Area */
.main-wrapper {
    flex-grow: 1;
    margin-left: var(--sidebar-width);
    display: flex;
    flex-direction: column;
    min-height: 100vh;
    transition: var(--transition-smooth);
}

/* Topbar */
.topbar {
    height: var(--topbar-height);
    background: var(--bg-panel-glass);
    backdrop-filter: blur(10px);
    border-bottom: 1px solid var(--border-color);
    display: flex;
    align-items: center;
    justify-content: space-between;
    padding: 0 32px;
    position: sticky;
    top: 0;
    z-index: 90;
}

.topbar-left, .topbar-right {
    display: flex;
    align-items: center;
    gap: 20px;
}

.menu-toggle {
    background: none;
    border: none;
    color: var(--text-main);
    font-size: 24px;
    cursor: pointer;
    transition: var(--transition-fast);
}
.menu-toggle:hover {
    color: var(--primary);
}

.user-profile {
    display: flex;
    align-items: center;
    gap: 12px;
    cursor: pointer;
    color: #fff;
    text-decoration: none;
}
.user-avatar {
    width: 40px;
    height: 40px;
    background: linear-gradient(135deg, var(--primary), #d97706);
    border-radius: 50%;
    display: flex;
    align-items: center;
    justify-content: center;
    font-weight: bold;
    color: #000;
    font-size: 18px;
    box-shadow: var(--shadow-glow);
}

/* Content Area */
.content-area {
    padding: 32px;
    flex-grow: 1;
}

/* Cards & Stats */
.stats-grid {
    display: grid;
    grid-template-columns: repeat(auto-fit, minmax(240px, 1fr));
    gap: 24px;
    margin-bottom: 32px;
}

.stat-card {
    padding: 24px;
    display: flex;
    align-items: center;
    justify-content: space-between;
    transition: transform 0.3s ease, box-shadow 0.3s ease;
}

.stat-card:hover {
    transform: translateY(-5px);
    box-shadow: 0 15px 30px -5px rgba(0,0,0,0.6);
}

.stat-info h3 {
    font-size: 14px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 1px;
    margin-bottom: 8px;
}

.stat-info .value {
    font-size: 32px;
    font-weight: 800;
    background: linear-gradient(to right, #fff, #cbd5e1);
    -webkit-background-clip: text;
    -webkit-text-fill-color: transparent;
}

.stat-icon {
    width: 60px;
    height: 60px;
    border-radius: 16px;
    display: flex;
    align-items: center;
    justify-content: center;
    font-size: 28px;
}
.icon-primary { background: rgba(245, 158, 11, 0.15); color: var(--primary); }
.icon-secondary { background: rgba(59, 130, 246, 0.15); color: var(--secondary); }
.icon-success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.icon-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

/* Tables */
.table-container {
    width: 100%;
    overflow-x: auto;
    margin-top: 24px;
}
.table-container table {
    width: 100%;
    border-collapse: collapse;
}
.table-container th, .table-container td {
    padding: 16px;
    text-align: left;
    border-bottom: 1px solid var(--border-color);
}
.table-container th {
    font-size: 13px;
    text-transform: uppercase;
    color: var(--text-muted);
    font-weight: 600;
    letter-spacing: 1px;
}
.table-container tbody tr {
    transition: background var(--transition-fast);
}
.table-container tbody tr:hover {
    background: rgba(255,255,255,0.03);
}

/* Badges */
.badge {
    padding: 6px 12px;
    border-radius: 20px;
    font-size: 12px;
    font-weight: 600;
    text-transform: uppercase;
    letter-spacing: 0.5px;
}
.badge-success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.badge-warning { background: rgba(245, 158, 11, 0.15); color: var(--primary); }
.badge-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }

/* Animations */
@keyframes fadeIn {
    from { opacity: 0; transform: translateY(10px); }
    to { opacity: 1; transform: translateY(0); }
}

.animate-fade-in {
    animation: fadeIn 0.5s cubic-bezier(0.4, 0, 0.2, 1) forwards;
}

/* Collapse Sidebar */
body.sidebar-collapsed .sidebar {
    transform: translateX(-100%);
}
body.sidebar-collapsed .main-wrapper {
    margin-left: 0;
}

@media (max-width: 992px) {
    .sidebar {
        transform: translateX(-100%);
    }
    .main-wrapper {
        margin-left: 0;
    }
    body.sidebar-open .sidebar {
        transform: translateX(0);
    }
}

/* Form Elemanları */
.form-group { margin-bottom: 20px; }
.form-label { display: block; margin-bottom: 8px; font-size: 13px; font-weight: 600; color: var(--text-muted); text-transform: uppercase; letter-spacing: 0.5px; }
.form-control { width: 100%; padding: 14px 16px; background: rgba(0, 0, 0, 0.25); border: 1px solid rgba(255, 255, 255, 0.1); border-radius: 10px; color: var(--text-main); font-family: inherit; font-size: 14px; transition: var(--transition-fast); }
.form-control:focus { outline: none; border-color: var(--primary); background: rgba(0, 0, 0, 0.5); box-shadow: 0 0 12px rgba(245, 158, 11, 0.2); }
.form-control::placeholder { color: rgba(255, 255, 255, 0.2); }
select.form-control { appearance: none; background-image: url("data:image/svg+xml;charset=UTF-8,%3csvg xmlns='http://www.w3.org/2000/svg' viewBox='0 0 24 24' fill='none' stroke='%2394a3b8' stroke-width='2' stroke-linecap='round' stroke-linejoin='round'%3e%3cpolyline points='6 9 12 15 18 9'%3e%3c/polyline%3e%3c/svg%3e"); background-repeat: no-repeat; background-position: right 15px center; background-size: 16px; }

/* Butonlar */
.btn { display: inline-flex; align-items: center; justify-content: center; gap: 8px; padding: 12px 24px; border: none; border-radius: 10px; font-size: 14px; font-weight: 600; cursor: pointer; transition: var(--transition-fast); text-decoration: none; }
.btn-primary { background: linear-gradient(135deg, var(--primary), #d97706); color: #000; box-shadow: 0 4px 15px rgba(245, 158, 11, 0.3); }
.btn-primary:hover { transform: translateY(-2px); box-shadow: 0 8px 25px rgba(245, 158, 11, 0.4); }
.btn-success { background: rgba(16, 185, 129, 0.15); color: var(--success); }
.btn-success:hover { background: rgba(16, 185, 129, 0.25); }
.btn-danger { background: rgba(239, 68, 68, 0.15); color: var(--danger); }
.btn-danger:hover { background: rgba(239, 68, 68, 0.25); }

/* Alerts / Settings Grid */
.alert { padding: 16px 20px; border-radius: 12px; margin-bottom: 24px; display: flex; align-items: center; gap: 12px; font-weight: 500; font-size: 15px; animation: fadeIn 0.5s ease; }
.alert-success { background: rgba(16, 185, 129, 0.1); border: 1px solid rgba(16, 185, 129, 0.2); color: var(--success); }
.settings-grid { display: grid; grid-template-columns: repeat(auto-fit, minmax(400px, 1fr)); gap: 30px; margin-bottom: 30px; }
.settings-card { padding: 25px; }
.settings-card h3 { font-size: 16px; margin-bottom: 24px; padding-bottom: 15px; border-bottom: 1px solid var(--border-color); display: flex; align-items: center; gap: 10px; color: var(--text-main); }